It's tricky with a long-fetch flow from the subtropics to anticipate just how far local variations might go in the lee of high ground, say. It looks like it could be a fine setup for producing localised exceptionally high temperatures in the vicinity of Hawarden in N. Wales for example, but it will depend on the exact direction of the flow, on which there remain considerable differences between GFS and ECM, as the latter has a stronger Euro High plus makes more of TC Ophelia as it moves to a point a little west of Iberia by Sunday.
Given that TD 17 - the likely precursor to Ophelia - has this morning been aligning its low-level circulation with deep convection, and that the NHC calls for intensification to a 60 mph storm with some scope in the model spreads for a hurricane, I'm inclined to side with the greater development depicted by ECM (along with UKMO and GEM for that matter). With that seems to come better support for the Euro High and the subtropical air transport on the NW flank of that.
This also brings me nicely onto the risk of being swiped by ex-Ophelia as it lifts north Sun/Mon to pass over or just west of the UK. Because of the unusual path taken and that this is from the fairly warm waters west of Iberia, the system may not long have lost tropical characteristics when it arrives, so the potential exists for some very strong winds and a lot of rain to affect either part or most of the UK.
Looks to me that ECM is slow enough with this to allow another unusually warm day on Monday, with Monday night then proving exceptionally mild but increasingly wet and windy.
GEM is some 24 hours faster having kept the jet stream a bit more vigorous (with the plume not reaching as far NW) during the weekend, but just look at those 850s... could quite widely be in the high-teens all night under that setup.
This is all very speculative though given it's still a week away - GFS' lack of tropical development, with Monday simply dry and cooler than of late, remains a plausible outcome.
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